Spokeswoman Danya Proud said Monday the world's largest hamburger chain has stopped serving sliced tomatoes on all of its sandwiches in the United States as a precaution until the source of the salmonella is known.

Proud says McDonald's will continue to serve grape tomatoes in its salads because no problems have been linked to that variety.

The source of the tomatoes responsible for the illnesses in at least 16 states has not been pinpointed. The Centers for Disease Control and Prevention has said at least 23 people have been hospitalized, and no deaths have been reported.

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